#include "stm32f10x.h"                  // Device header
#include <stdio.h>
#include <stdarg.h>

uint8_t Serial_TxPacket[4];
uint8_t Serial_RxPacket[4];
uint8_t Serial_RxFlag;  
void Serial_Init(void)
{
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF_PP;
	GPIO_InitStruct.GPIO_Pin=GPIO_Pin_9;
	GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_InitStruct);
	GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPU;
	GPIO_InitStruct.GPIO_Pin=GPIO_Pin_10;
	GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_InitStruct);
	
	USART_InitTypeDef USART_InitStruct;
	USART_InitStruct.USART_BaudRate=9600;
	USART_InitStruct.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
	USART_InitStruct.USART_Mode=USART_Mode_Tx | USART_Mode_Rx;
	USART_InitStruct.USART_Parity=USART_Parity_No;
	USART_InitStruct.USART_StopBits=USART_StopBits_1;
	USART_InitStruct.USART_WordLength=USART_WordLength_8b;
	USART_Init(USART1,&USART_InitStruct);
	
	USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	NVIC_InitTypeDef NVIC_InitStruct;
	NVIC_InitStruct.NVIC_IRQChannel=USART1_IRQn ;
	NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=1;
	NVIC_InitStruct.NVIC_IRQChannelSubPriority=1;
	NVIC_Init(&NVIC_InitStruct);
	
	USART_Cmd(USART1,ENABLE);
}
void Serial_SendByte(uint8_t Byte)
{
	USART_SendData(USART1,Byte);
	while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
}
void Serial_SendArray(uint8_t *Array,uint16_t Length)
{
	uint16_t i;
	for(i=0;i<Length;i++)
	{
		Serial_SendByte(Array[i]);
	}
}
void Serial_SendString(char *String)
{
	uint8_t i;
	for(i=0;String[i]!='\0';i++)
	{
		Serial_SendByte(String[i]);
	}
}
uint32_t Serial_Pow(uint32_t X,uint32_t Y)
{
	uint32_t Result=1;
	while(Y--)
	{
		Result*=X;
	}
	return Result;
}
void Serial_SendNum(uint32_t Num,uint8_t Length)
{
	uint8_t i;
	for(i=0;i<Length;i++)
	{
		Serial_SendByte(Num / Serial_Pow(10,Length-i-1) %10 + '0');
	}
}
int fputc(int ch,FILE *f)
{
	Serial_SendByte(ch);
	return ch;
}
void Serial_Printf(char *format,...)
{
	char String[100];
	va_list arg;
	va_start(arg,format);
	vsprintf(String,format,arg);
	va_end(arg);
	Serial_SendString(String);
}
void Serial_SendPacket(void)
{
	Serial_SendByte(0xFF);
	Serial_SendArray(Serial_TxPacket,4);
	Serial_SendByte(0xFE);
}
uint8_t Serial_GetRxFlag(void)
{
	if(Serial_RxFlag==1)
	{
		Serial_RxFlag=0;
		return 1;
	}
	return 0;
}

void USART1_IRQHandler(void)
{
	static uint8_t RxState=0;
	static uint8_t pRxPacket=0;
	if(USART_GetITStatus(USART1,USART_IT_RXNE)==SET)
	{
		uint8_t RxData=USART_ReceiveData(USART1);
		if(RxState==0)
		{
			if(RxData==0xFF)
			{
				RxState=1;
				pRxPacket=0;
			}
		}
		else if(RxState==1)
		{
			Serial_RxPacket[pRxPacket]=RxData;
			pRxPacket++;
			if(pRxPacket>=4)
			{
				RxState=2;
			}
		}
		else if(RxState==2)
		{
			if(RxData==0xFE)
			{
				RxState=0;
				Serial_RxFlag=1;
			}
		}
		USART_ClearITPendingBit(USART1,USART_IT_RXNE);
	}
}
